Java项目中的多线程有哪些关键字

package com.ietree.multithread.sync;public class SynAndAsynDemo {  public static void main(String[] args) {        final SynAndAsynDemo mo = new SynAndAsynDemo();        Thread t1 = new Thread(new Runnable() {      @Override      public void run() {        mo.methodA();      }    },"t1");        Thread t2 = new Thread(new Runnable() {      @Override      public void run() {        mo.methodB();      }    },"t2");        t1.start();    t2.start();  }    // 方法A  public synchronized void methodA(){    try {      System.out.println(Thread.currentThread().getName());      // 休眠4秒      Thread.sleep(4000);    } catch (InterruptedException e) {      e.printStackTrace();    }  }    // 方法B  public void methodB(){    System.out.println(Thread.currentThread().getName());  }  }